$\frac{1}{\cos ^{2} \theta}-1 = \ldots$

  • A
    $\sin ^{2} \theta$
  • B
    $\cot ^{2} \theta$
  • C
    $\tan ^{2} \theta$
  • D
    $\operatorname{cosec}^{2} \theta$

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જો $\tan 7 \theta \cdot \tan 3 \theta = 1$ હોય,તો $\theta$ ની કિંમત .......... છે.

$\frac{\sec \theta-1}{\sec \theta+1} = \ldots$

જો $A, B$ અને $C$ એ ત્રિકોણ $ABC$ ના અંતઃકોણો હોય,તો સાબિત કરો કે $\sin \left(\frac{B+C}{2}\right) = \cos \frac{A}{2}$.

$(1+\tan ^{2} \theta)(1-\cos ^{2} \theta) = \dots$

જો $2 \sin^{2} \theta - \cos^{2} \theta = 2$ હોય,તો $\theta$ ની કિંમત શોધો. ($^{\circ}$ માં)

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